Sierra Shields 1600 WaterHeater Hose 1 x 50 Sierra Shields 1600 WaterHeater Hose has a good bend radius, fabric reinforced has an EPDM tube cover. It is resistant to mild chemicals, heat, cold, ozone, and saltwater. Specifications Wt. C 52 O.D. 1 2964 or 36.8mm I.D. 1 or 25.4mm Working Pressure 300 PSI The temperature ranges from -40F - 190F Applications This hose is primarily used for critical water connections, heat exchanger, toilet intake Also used for small engine intake, bilge pump intak